HTK-391型红外线探头定标方法?
咬上唇习惯引起()
A:前牙梭形开
B:前牙反
C:上前牙前突,下颌后缩,深覆
D:上牙弓狭窄,腭盖高拱 E:颜面不对称


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若
,且
为锐角,则
=_____度.
.已知连续不断函数f(x)=sinx+x﹣
(0<x<
),g(x)=cosx﹣x+
(0<x<
).
(1)求证:函数f(x)在区间(0,
)上有且只有一个零点;
(2)现已知函数g(x)在(0,
)上有且只有一个零点(不必证明),记f(x)和g(x)在(0,
)上的零点分别为x1,x2,求证:x1+x2=
.
【考点】函数零点的判定定理.
【专题】证明题;函数思想;综合法;函数的性质及应用.
【分析】(1)可判断f(0)=﹣<0,f()=>0,再判断函数的单调性,从而证明.
(2)化简可得cos(﹣x1)﹣(﹣x1)+=0,从而证明.
【解答】证明:(1)∵f(0)=﹣<0,f()=>0,
∴f(x)在区间(0,)上有一个零点;
又∵f(x)=sinx+x﹣在(0,)上单调递增,
∴f(x)在(0,)上有且只有一个零点;
(2)∵f(x)在区间(0,)上有且只有一个零点x1,
∴f(x1)=sinx1+x1﹣=0,
即cos(﹣x1)﹣(﹣x1)+=0,
又∵函数g(x)在(0,)上有且只有一个零点x2,
∴﹣x1=x2,
即x1+x2=.
【点评】本题考查了函数的零点的判定定理的应用及函数的性质的判断与应用.
A warm - heart nurse on her first day’s work came to | 76.__________________ |
a patient. She asked him she could do anything for | 77.__________________ |
him, and he only waved his hands and said something | 78.__________________ |
she could hardly understanD. She asked him again | 79.__________________ |
and he just kept saying the different words, but | 80.__________________ |
in a more lower voice, before closing his eyes. She | 81.__________________ |
felt his pulse and found him death. She rushed to | 82.__________________ |
repeat to the doctor sounds she had hearD. “My | 83.__________________ |
dear girl,” said the doctor after listen carfully to | 84.__________________ |
what she repeats,“he was saying you’re standing on | |
my oxygen pipE.” | 85.__________________ |
76.warm-heart→warm-hearted.
解析:“形容词+名词+ed”构成复合形容词。
77.him∧→if/whether.
解析:if/whether意为“是否”,在此引导宾语从句。
78.and→but.
解析:表转折应使用but.
79.√
80.different→same.
解析:由keep saying可推知。
81.more→much或去掉more.
解析:lower是low的比较级,所以不可再用more.“much+比较级”意为“…的多”。
82.death→dead.
解析:find him dead意为“发现他死了”。
83.∧sounds→the.
解析:sounds后接定语从句,表特指应带定冠词the.
84.1isten→1istening.
解析:介词after后接动词-ing形式作宾语。时。
85.repeats→repeated.
解析:讲述过去的情况应使用过去
How time flies ! 1t is 2 years after I came | 76. |
to NO 1 middle school.In the past,l was used to | 77. |
spend much time on computer games and was tired | 78. |
my studies.As the result,I fell far behind | 79. |
another students in my class.How I regretted | 80. |
wasting so much time.Losing time can never | 81. |
be returned.Now I am trying hard to do all | 82. |
I can to catch up with my classmate.I am sure | 83. |
you will make great progress and my dreams | 84. |
will be come true in the near future. | 85. |
76.after改为Since 77.去掉was
78.tired后加of 79.the改为a
80.another改为other 81.losing改为lost
82.√ 83.classmate改为classmates
84.you改为I 85.去掉be
There are several ways improve our English writing skills, | 76.________ |
such as keeping a diary, learning any good writings by heart, | 77.________ |
doing a lot of reading, etc, among that I prefer keeping a diary. | 78.________ |
Comparing with other forms of writing, keeping a diary is easy | 79.________ |
and take less timE. In addition, it can help us form the habit | 80.________ |
of thinking in English. If we can keep this practice, we will | 81.________ |
gradually learn how to express us in English. What's more, | 82.________ |
keeping a diary can be as talking with one of your close friends, | 83.________ |
sharing in your happiness or sadness. In a simple word, keeping | 84.________ |
a diary was a good way of improving your written English. | 85._______ |
76. ways后加to 77. any改为some 78. that改为which
79. Comparing改为Compared 80. take改为takes 81. √
82. us改为ourselves 83. as改为like 84. 去掉simple
85. was 改为is
民以食为天,如今,这片天却出现了窟窿——食品安全成了当今中国最大的民生难题之一。请从政治生活的角度,分别针对不同的主体如何保障食品安全提几条合理化建议。
主体 | 建议性质及具体措施举例 |
全国人大 | 行使立法权,健全市场法律法规。如制定《食品安全法》等。 |
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主体 | 建议性质及具体措施举例。 |
全国人大 | 行使立法权,健全市场法律法规。如制定《食品安全法》等 |
政府 | 履行市场监管职能。如完善市场监督机制,加大监管力度;履行文化职能,做好宣传教育工作,提高各个市场主体的法律意识和道德素质等。 |
司法机关 | 严格执法、公正司法。如加大打击力度,严惩制售假冒伪劣食品的违法行为等。 |
人民政协 | 进行民主监督。如就食品安全监管问题向有关国家机关提出意见、建议等 |
公民、企业 | 权利义务统一,树立权利意识和义务意识。如企业应该遵循市场秩序和价值规律合法经营等。 |